My biggest dream is being a graceful tumbler at age 20. Is that still possible?

I always dreamed of being a Ballerina. I started Ballet at age 6 and till I was twelve I took classes 2 times a week. Then I had an injury and was forced to quit. I was very sad beacause I always wanted to be really good in a sport, beceause sports is somehow magical to me! It was very compliacted and I fully recovered at age 15, but then I was in the middle of puberty and boys, parties and school became more important and I thought I couldn't do any of the moves anymore. Now I am 20, in college and my dream of being really good in a sport is still lasting. I tried to do something else like getting more into make-up, fashion and singing. But I always find myself dreaming of having a really cool sports hobby! I now dared to start a gymnastics lesson in my hometown in Austria. You have to know that here in Austria, we have almost no gyms, in Vienna we only have one gym which has uneven bars to train on! The same is with ballet. There are tons of little kiddie ballet classes, but nothing for older people who still want to take up bellet more seriously!

Anyways, I now decided to make something of my dream. I don't dream of becoming really rich, of getting a specific car or whatever... my two dreams in life are seeing as much of the world and become really really good in one sport! And I really want to fight for it, beacause I am sure this is what I want as I dreames of it since I was little!

So I decided for myself to get into tumbling, which means roundoffs, handsprings, tucks and walkovers. Gymnastics for me, as a ballet-lover, it a little bit too masculin but ballet is a littlebit boring. I don't want to be a pointe-dancer, I just want to have the grace thes dancers have. So my goals are those:

Being a very very very graceful tumbler with the following skills:

Handstand free for 1 minute

Press Handstand from Straddle-Sit

Oversplits (I have my right side oversplit already about 10 inches)

Walkovers (I have the front walkover and a quiet good bridge)

Round-Off

Aerial

Backhandspring and Front Handspring

Back Tuck and Front Tuck

20 hanging Leg Lifts

20 Pull-Ups

I want to work very very hard, I could spend 15 hours of training a week.

My dream is to achieve this, maybe get a sports sholarship in cheerleading in two years to be able to study in the USA!

I don't want to be a professional or performing, just doing it as fun but be quiet good at it and maye one time assist some tumbling classes at my college.

Here is a video of what I would like to be able to do. I know these kids are very very flexible in their back, maybe I won't be that flexible but I'm already quite felxible and stretch out maybe once in two weeks! They also don't do round-offs, back tucks or press handstands, but I'm pretty sure they could.

http://www.youtube.com/watch?v=lc6j3IT0Bbw

So do you think this is possible? Maybe not as perfect ad they are but about that! Will it work? How long would you think would that take if I work hard?

Do you think with these skills I will get a scholarship for cheerleading?

I hope you can help me!